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Across 2. a true statement that follows as a result of othertrue statements. IT MUST BE PROVEN. 3. rules that had to be proven. 5. two adjacent angles whose non-common sides are opposite rays. (two words) 9. a line that intersects two or more coplaner lines at different points. 10. consists of two different rays that have the same initial point. 14. if the sum of two angles is 180, then they are _____________. 18. two planes that do not intersect. 25. a logical statements with two parts. (two words) 26. a conditional statement that is formed by swithing the hypothesis and the conclusion. 29. points that do not lie on the same line. (two words) 31. part of a line that consists of an initial point and all points to one side of thgat point. 34. angle that measeures 89 degrees or less. (two words) 35. lines that do not intersect and are not coplaner are __________. 36. two collinear rays that have the same initial point, but extend in opposite directions. (two words) 37. the "then" part of a conditional statement. 39. an example that shows a conjecture is false. 40. point, line, plane are all ___________ terms. 41. angle that measures exactly 180 degrees. (two words) 42. a statement formed by writing the negative of the original statement. 43. angle that measures exactly 90 degrees. (two words) 44. if two lines are coplaner and do not intersect, then they are _____________. 45. part of a line that conists of two endpoints and all of the points in between.

Down 1. a=a; ___________ property. 3. if a=b and b=c, then a=c; ____________ property. 4. if a=b, then b=a; ____________ property. 6. the set of points that figures have in common. 7. rules that are accepted without proof. "duh" 8. the "if" part of a conditional statement. 11. points that do not lie on the same plane. (two words) 12. if two lines intersect to form a right angle, then they are ___________. 13. two angles that share a common vertex, a common side, and no common interior points. (two words) 15. points that lie on the same plane. (two words) 16. a statment that coontains the phrase "if and only if" and is equivalent to writing a conditional statement and its converse. (two words) 17. using facts, definitions, and accepted properties in a logical order to write a logical argument. (two words) 19. points that lie on the same line. (two points) 20. if the sum of two angles is 90, than they are 21. segments that have the same length. (two words) 22. a process that involves looking for patterns and making conjectures. (two words) 23. vertical angles are ____________. 24. a segment, ray, line, or plane that divides a segmentat its midpoint. (two words) 27. a conditional statement that is formed by switching and negating th hypothesis and the conclusion. 28. an unproven statement that is based om observations. 30. a ray that divides an angle into two adjacent angles that are congruent. (two words) 32. a point that divides a segment into two congruent segments. 33. angle that measures from 91 degrees to 179 degrees. (two words) 38. abbreviation for "if and only if".